Spelling Jungle, also known as Basic Spelling Tricks or Yobi's Magic Spelling tricks, is a top-down 2D puzzle game developed by Bright Star Technology in 1993. From Wikipedia:
The objective of Spelling Jungle is to paddle a raft up the river and stopping the flooding at its source. The player must make frequent stops in his journey and complete puzzles, where the player must walk over letter tiles in order to spell out a certain word, avoiding enemies like lions, alligators, or demons, in order to advance farther up the river. The game features 101 levels total that become more difficult and complex as the player ventures farther upriver.